Question: How can I add operators to a expression in order to plot it with implicit_plot3d? (SAGE)

Sorry if it's a dumb question, i'm new with Sage.

I'm doing the multiplication of two matrix and I obtain the expression 

 

[142√(2x−2√)+122√y] 

I want to represent this on 3d, but I realized that the expression has to be written with operators '*'

How can I add the operators to my expression?

 

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